Daystar 0.28A (0.3A) Quantum PE H-Alpha solar filter. The flagship H-Alpha filter at Daystar. This filter goes the deepest into the H-Alpha wavelength and is of professional (research-grade) quality. The details on the solar disk are phenomenal, both visually and photographically. All warranties for this unit are in place for several years. Since I have a great personal relationship with the management at Daystar, the etalon underwent extensive testing and was considered a very high performance unit. I can't emphasize the latter fact enough. The etalon is very new (manufactured this summer). The housing is older (I used it when it was a .4A). But I had also changed the front glass, etc. So it is in very good shape. I always kept it in a climate controlled environment. I am obsessive about the condition of my equipment. Includes instructions and test results. Retail: $16,100 USD for a new Quantum PE.3A. I am asking for $6,500 USD (negotiable).